Understanding the Performance (Timing) Before going to understand the performance (timing), lets understand how timing is getting checked. At placement stage we have the placement of cells information, but we don’t have connection information in between the cells so how…
What is Congestion? If the number of required routing resources exceeds the available routing tracks, the area becomes congested. High congestion leads to detours and poorer results. Severe congestion can make the design non-routable, meaning routing will not converge if…
What is Placement Optimization? Depending on the stages of the design, optimization can include the following operations: Secondary PG Routing As we know there are many partitions now a days, so we are dealing with UPF and number of power…
We understand how scan chains are inserted and their impact on the circuit. Now, let’s focus on the main topic: how the tool optimizes the scan chain. Scan chain reordering helps optimize routing resources and reduces congestion in the design.…
Refine Placement (Legalization) There are number of tool options which we can use for refining the placement, like you can set some micron distance so that tool will not move those cells more than specified distance. Detailed Placement
During placement, following three stages happens: Global Placement Global placement is very first stage of the placement where cells are placed inside the core area for the first time looking at the timing and congestion. Global Placement aims at generating…
Pre-Placement Sanity Checks Before proceeding with the placement of standard cells, pre-placement sanity checks are performed to ensure the design is in good shape. These checks help identify potential issues early, preventing delays in the later stages of physical design.…
What is Placement? Once we are done with the floorplan after placing all the physical cells inside the core boundary, we are left with standard cells which are still sitting out of the core design area. Now we need to…